102120154 has 4 divisors (see below), whose sum is σ = 153180234. Its totient is φ = 51060076.

The previous prime is 102120131. The next prime is 102120167. The reversal of 102120154 is 451021201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 451021201 = 31 ⋅14549071.

It can be written as a sum of positive squares in only one way, i.e., 97476129 + 4644025 = 9873^2 + 2155^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25530037 + ... + 25530040.

Almost surely, 2^102120154 is an apocalyptic number.

102120154 is a deficient number, since it is larger than the sum of its proper divisors (51060080).

102120154 is an equidigital number, since it uses as much as digits as its factorization.

102120154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51060079.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 102120154 is about 10105.4516969802. The cubic root of 102120154 is about 467.4162645647.

Adding to 102120154 its reverse (451021201), we get a palindrome (553141355).

The spelling of 102120154 in words is "one hundred two million, one hundred twenty thousand, one hundred fifty-four".